| Silicon is the beneficial element for plant growth which has been confirmed bysome researchers. Silicon has played important roles on alleviating the biotic and abioticstresses of in rice. In the northeast of China, chilling stress occurs frequently, which canimpact on the yield and quality of rice and has become the main restriction factor forrice production. Therefore, how to improve the ability of resistance to chilling injury ofrice has become the urgent problem for rice scientists. In this study, a few rice cultivarsand rice silicon mutants are used for nutrient solution culture. The objective of thisstudy is to analysis the roles of silicon on rice seedling biomass, osmotic regulationsubstances, antioxidant enzyme activities and their effects on chlorophyll content of riceplants under low temperature stress of silicon. The main results are as follows:1. Effects of low temperature stress on rice plants in MDA, soluble sugar and prolinecontent increased, leaf tissue CAT, POD and SOD activity were increased, PODand SOD activity increased at first, then decreased, and the cell membranepermeability with low temperature stress time increasing, the content ofchlorophyll and the chlorophyll a/b decreased.2. Silicon can promote the rice plant biomass increased, improving rice mechanicalstrength, partial remission of rice seedling under low temperature stress effect onthe growth of; Moreover, MDA, soluble sugar and proline content decreasedobviously. The SOD and POD activity and the cell membrane stability wereenhanced. The cold tolerance of Beidao4and Kongyu131cold resistance isstronger than Kendao21and Longyang1.3. The chlorophyll content and chlorophyll ratio of rice plants which cultivated inKimura B with silicon under low temperature stress were maintained. Moreover,the silicon contents of rice shoots are higher than the roots. 4. The cold tolerance of rice is improved significantly when rice plants were plantedwith different concentrations of silicon solutions. |
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